shell:$ nslookup -timeout=2 -retry=1 'infoc2.duba.net'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
infoc2.duba.net	canonical name = infoc2.ksmobile.com.
Name:	infoc2.ksmobile.com
Address: 139.9.36.107
Name:	infoc2.ksmobile.com
Address: 121.37.233.133
Name:	infoc2.ksmobile.com
Address: 139.9.45.227
Name:	infoc2.ksmobile.com
Address: 139.9.43.42
Name:	infoc2.ksmobile.com
Address: 139.9.43.12
Name:	infoc2.ksmobile.com
Address: 139.9.35.91
Name:	infoc2.ksmobile.com
Address: 139.9.36.178
Name:	infoc2.ksmobile.com
Address: 121.37.247.153
Name:	infoc2.ksmobile.com
Address: 139.9.37.26
Name:	infoc2.ksmobile.com
Address: 139.9.36.246
Name:	infoc2.ksmobile.com
Address: 139.9.44.129